The powertrain control module on your 2010 Chrysler PT Cruiser must be programmed with the vehicle identification number in order for it to work. You can do this using some scanners during installation, or you can buy the PCM from a merchant who will program it with your VIN. The pre-programmed PCM is plug-and-play, requiring no special tools or equipment for installation. After installation, you may notice some driveability issues that will subside as you drive the car and allow it to relearn its adaptive driving strategy.
Remove the key from the ignition. Open the hood and support it with the hood prop.
Using a flat screwdriver, loosen the intake air hose clamp at the air cleaner housing, and disconnect the hose from the housing outlet. Lift up slightly on the air cleaner, and remove the air inlet duct from the housing. Lift the housing up and out of the engine compartment.
Loosen the negative battery cable terminal pinch bolt, using a ratchet and socket. Rotate the terminal slightly to break it loose from the battery post, then disconnect the terminal from the battery. Lay the cable aside where it cannot accidentally make contact with the negative battery post.
Locate the PCM assembly on the driver-side firewall, near the brake master cylinder. Lift up on the lock tabs on the electrical connectors, and disconnect the PCM from the vehicle wiring harness.
Using a ratchet and socket, remove the three PCM bracket retainer bolts and pull the bracket off the firewall. Turn the assembly over and, using a ratchet and socket, remove the four retainer nuts. Separate the old PCM from the bracket.
Position the new PCM on the bracket. Install the retainer nuts and torque them to 95 inch-pounds, using an inch-pound torque wrench and socket.
Position the PCM assembly on the firewall. Install and torque the retainer bolts to 35 inch-pounds. Plug the electrical connectors in, and ensure that the lock tabs snap securely into place.
Install the negative cable terminal on the negative battery post. Torque the terminal pinch bolt to 110 inch-pounds.
Lower the air cleaner housing into place. Install the fresh air inlet duct in its port in the housing, and slip the intake air hose over the outlet port on the housing. Tighten the intake air hose clamp securely.
